members :: string (optional): Which logistic members to insert the items to. Must be
"storage", "storage-empty" (storage chests that are completely empty),
"storage-empty-slot" (storage chests that have an empty slot), or "requester". If not
specified, inserts items into the logistic network in the usual order.

Is this object valid? This Lua object holds a reference to an object within
the game engine. It is possible that the game-engine object is removed whilst
a mod still holds the corresponding Lua object. If that happens, the object
becomes invalid, i.e. this attribute will be false. Mods are advised to
check for object validity if any change to the game state might have occurred
between the creation of the Lua object and its access.